如何自动读取x86 ASM中的值? [英] How do I atomically read a value in x86 ASM?

问题描述

我知道如何在x86 ASM中自动写入一个值.但是，我该怎么读? LOCK前缀不能与mov一起使用.

I know how to atomically write a value in x86 ASM. But how do I read one? The LOCK prefix can't be used with mov.

要增加价值，我正在做

lock inc dword ptr Counter

如何以线程安全的方式读取Counter?

How do I read Counter in a thread-safe way?

推荐答案

我不是汇编专家，但是字大小(在x86，32位上)的读/写应该已经是原子的.

I'm not an assembly expert, but word-sized (on x86, 32-bit) reads/writes should be atomic already.

您需要锁定增量的原因是因为这既是读取又是写入.

The reason you need to lock the increment is because that's both a read AND a write.

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